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// SPDX-License-Identifier: Apache-2.0 OR MIT
macro_rules! atomic128 {
($atomic_type:ident, $int_type:ident, $atomic_max:ident, $atomic_min:ident) => {
#[repr(C, align(16))]
pub(crate) struct $atomic_type {
v: core::cell::UnsafeCell<$int_type>,
}
// Send is implicitly implemented.
// SAFETY: any data races are prevented by atomic intrinsics.
unsafe impl Sync for $atomic_type {}
impl_default_no_fetch_ops!($atomic_type, $int_type);
impl_default_bit_opts!($atomic_type, $int_type);
impl $atomic_type {
#[inline]
pub(crate) const fn new(v: $int_type) -> Self {
Self { v: core::cell::UnsafeCell::new(v) }
}
#[inline]
pub(crate) fn is_lock_free() -> bool {
is_lock_free()
}
#[inline]
pub(crate) const fn is_always_lock_free() -> bool {
IS_ALWAYS_LOCK_FREE
}
#[inline]
pub(crate) fn get_mut(&mut self) -> &mut $int_type {
// SAFETY: the mutable reference guarantees unique ownership.
// (UnsafeCell::get_mut requires Rust 1.50)
unsafe { &mut *self.v.get() }
}
#[inline]
pub(crate) fn into_inner(self) -> $int_type {
self.v.into_inner()
}
#[inline]
#[cfg_attr(
any(all(debug_assertions, not(portable_atomic_no_track_caller)), miri),
track_caller
)]
pub(crate) fn load(&self, order: Ordering) -> $int_type {
crate::utils::assert_load_ordering(order);
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_load(self.v.get().cast::<u128>(), order) as $int_type }
}
#[inline]
#[cfg_attr(
any(all(debug_assertions, not(portable_atomic_no_track_caller)), miri),
track_caller
)]
pub(crate) fn store(&self, val: $int_type, order: Ordering) {
crate::utils::assert_store_ordering(order);
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_store(self.v.get().cast::<u128>(), val as u128, order) }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn swap(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_swap(self.v.get().cast::<u128>(), val as u128, order) as $int_type }
}
#[inline]
#[cfg_attr(
any(all(debug_assertions, not(portable_atomic_no_track_caller)), miri),
track_caller
)]
pub(crate) fn compare_exchange(
&self,
current: $int_type,
new: $int_type,
success: Ordering,
failure: Ordering,
) -> Result<$int_type, $int_type> {
crate::utils::assert_compare_exchange_ordering(success, failure);
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe {
match atomic_compare_exchange(
self.v.get().cast::<u128>(),
current as u128,
new as u128,
success,
failure,
) {
Ok(v) => Ok(v as $int_type),
Err(v) => Err(v as $int_type),
}
}
}
#[inline]
#[cfg_attr(
any(all(debug_assertions, not(portable_atomic_no_track_caller)), miri),
track_caller
)]
pub(crate) fn compare_exchange_weak(
&self,
current: $int_type,
new: $int_type,
success: Ordering,
failure: Ordering,
) -> Result<$int_type, $int_type> {
crate::utils::assert_compare_exchange_ordering(success, failure);
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe {
match atomic_compare_exchange_weak(
self.v.get().cast::<u128>(),
current as u128,
new as u128,
success,
failure,
) {
Ok(v) => Ok(v as $int_type),
Err(v) => Err(v as $int_type),
}
}
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn fetch_add(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_add(self.v.get().cast::<u128>(), val as u128, order) as $int_type }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn fetch_sub(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_sub(self.v.get().cast::<u128>(), val as u128, order) as $int_type }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn fetch_and(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_and(self.v.get().cast::<u128>(), val as u128, order) as $int_type }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn fetch_nand(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_nand(self.v.get().cast::<u128>(), val as u128, order) as $int_type }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn fetch_or(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_or(self.v.get().cast::<u128>(), val as u128, order) as $int_type }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn fetch_xor(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_xor(self.v.get().cast::<u128>(), val as u128, order) as $int_type }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn fetch_max(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { $atomic_max(self.v.get().cast::<u128>(), val as u128, order) as $int_type }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn fetch_min(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { $atomic_min(self.v.get().cast::<u128>(), val as u128, order) as $int_type }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn fetch_not(&self, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_not(self.v.get().cast::<u128>(), order) as $int_type }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn not(&self, order: Ordering) {
self.fetch_not(order);
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn fetch_neg(&self, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_neg(self.v.get().cast::<u128>(), order) as $int_type }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
pub(crate) fn neg(&self, order: Ordering) {
self.fetch_neg(order);
}
#[inline]
pub(crate) const fn as_ptr(&self) -> *mut $int_type {
self.v.get()
}
}
};
}
#[cfg(any(target_arch = "powerpc64", target_arch = "s390x", target_arch = "x86_64"))]
#[allow(unused_macros)] // also used by intrinsics.rs
macro_rules! atomic_rmw_by_atomic_update {
() => {
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_swap(dst: *mut u128, val: u128, order: Ordering) -> u128 {
// SAFETY: the caller must uphold the safety contract.
unsafe { atomic_update(dst, order, |_| val) }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_add(dst: *mut u128, val: u128, order: Ordering) -> u128 {
// SAFETY: the caller must uphold the safety contract.
unsafe { atomic_update(dst, order, |x| x.wrapping_add(val)) }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_sub(dst: *mut u128, val: u128, order: Ordering) -> u128 {
// SAFETY: the caller must uphold the safety contract.
unsafe { atomic_update(dst, order, |x| x.wrapping_sub(val)) }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_and(dst: *mut u128, val: u128, order: Ordering) -> u128 {
// SAFETY: the caller must uphold the safety contract.
unsafe { atomic_update(dst, order, |x| x & val) }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_nand(dst: *mut u128, val: u128, order: Ordering) -> u128 {
// SAFETY: the caller must uphold the safety contract.
unsafe { atomic_update(dst, order, |x| !(x & val)) }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_or(dst: *mut u128, val: u128, order: Ordering) -> u128 {
// SAFETY: the caller must uphold the safety contract.
unsafe { atomic_update(dst, order, |x| x | val) }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_xor(dst: *mut u128, val: u128, order: Ordering) -> u128 {
// SAFETY: the caller must uphold the safety contract.
unsafe { atomic_update(dst, order, |x| x ^ val) }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_not(dst: *mut u128, order: Ordering) -> u128 {
// SAFETY: the caller must uphold the safety contract.
unsafe { atomic_update(dst, order, |x| !x) }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_neg(dst: *mut u128, order: Ordering) -> u128 {
// SAFETY: the caller must uphold the safety contract.
unsafe { atomic_update(dst, order, u128::wrapping_neg) }
}
atomic_rmw_by_atomic_update!(cmp);
};
(cmp) => {
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_max(dst: *mut u128, val: u128, order: Ordering) -> u128 {
#[allow(clippy::cast_possible_wrap, clippy::cast_sign_loss)]
// SAFETY: the caller must uphold the safety contract.
unsafe {
atomic_update(dst, order, |x| core::cmp::max(x as i128, val as i128) as u128)
}
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_umax(dst: *mut u128, val: u128, order: Ordering) -> u128 {
// SAFETY: the caller must uphold the safety contract.
unsafe { atomic_update(dst, order, |x| core::cmp::max(x, val)) }
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_min(dst: *mut u128, val: u128, order: Ordering) -> u128 {
#[allow(clippy::cast_possible_wrap, clippy::cast_sign_loss)]
// SAFETY: the caller must uphold the safety contract.
unsafe {
atomic_update(dst, order, |x| core::cmp::min(x as i128, val as i128) as u128)
}
}
#[inline]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
unsafe fn atomic_umin(dst: *mut u128, val: u128, order: Ordering) -> u128 {
// SAFETY: the caller must uphold the safety contract.
unsafe { atomic_update(dst, order, |x| core::cmp::min(x, val)) }
}
};
}
|
